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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80559249a3990e77730c4dd70259c77ba9b2b4e32a32419e5fbee07f81b87a4a' 
  AND token = '3oHLklsLENAKkbH9EEKvVJzRFma6u3hI57yYAJxcQqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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