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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822e2c4f03ceacab4dbf167bf456fce17c31b6ff3177d19473ffaa953547d5ae' 
  AND token = 'UaiApIYPRfFoph4JFT6bafTMqn7FzMGQ5Uz/BH6R85U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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