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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bb19c10c72379c080f2804846bee64fd78616cf5d787ea19c007e17c55ebca' 
  AND token = 'NxHzP43OGkId4ZEZhCyo0M5XroZ9k8is5eGFImha44I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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