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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87df730a184211429dc49a53b90ec564b6a7ebc9e1750b3ed7e22efad72c55a0' 
  AND token = '0hP/vVRz5ObCWB3B3rBHJsRmSbTabpkaCSLFnRbVHM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}