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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7aa1b7a97d654518a662f2f1e2b4b2652f279da660004d6e8b88c336bc0292' 
  AND token = 'M2OFU5RuNvjELXYAcdFTbwJqrABuwAqqtm74CrDQxKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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