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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a530589031ae99bfd71ffea04d69c9bee12c7f1b5fbafbdc14a9e6b518327da8' 
  AND token = 'I8Zi8cbyUnpfjG2NbuMVYkO1ONNkT3SG078zjM9Ir0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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