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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a18e611678e13fa8d2cc36aa472cabf0d54057c040bc962c5d42641d7520f2f' 
  AND token = 'Pu/rhRXwZOMaNLKHecYk4j2wunihbx9IfYIgOM9dmK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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