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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bd6a5473e7e21ba2400ce97bc6b86b851c440787d642e4933c569124498a32' 
  AND token = 'KUdpvO6DOdkQB8rEbwhMXS3ENR/6oiwULda2LxSwG0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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