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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871fd2db82eaaee28e2c04b16c6c88b9b2137a9162910c64995e09cffd518c6b' 
  AND token = 'GpWaUvKzk5i9Z9CHPG4MQ2BCxvL4/e9KGuDEaYVTau8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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