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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185e466200eae153378a0773c11bd5881bb3ad5ab0e7c7abf58dbd7cfd3584ac' 
  AND token = 'x0su/EjmKbzhtNV+UA9has74XOQ8WuWRxXNEj3IZU9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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