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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfcf1b0824dce2cfc67d8617ae7faed8a0a19b52b5e3f901a1a275a6c09e79e' 
  AND token = '0526JtFWx67Zar8QT0ZLkoun5Aj9zvr9H+RNvpSCG54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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