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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a36f52dab7139f59f8e63baeae9ece6d2eb06fdd38a458003ea17111169f41' 
  AND token = '86bevV5UG+fCRTcQeUpbnL6LpYzRG1G5ZN4IoWTvPJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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