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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0092143d6f52f54149ac814647903b9c35c89ad7c490fd890c519f32ceb742b3' 
  AND token = 'XZ4YCy2KWjV/96AkBaj3Ugo75VbNj9HKd5hBoyvmWCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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