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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef0e02f5546701eef8dff0b6ad1e95b5ebbf39df89677a42bf1a8280c6fbf8c' 
  AND token = 'AHIy+JXrsxey8ggPmBW5i9eQtpkhGCqB/OS7ayYkzTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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