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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaead9553ace9dc3423322a277f86814f3e7bb4bcd7aa34471d718a302c01fb' 
  AND token = 't4q8UmKjIQ5oTlb47qvTZcXcGRauR19F88ay6Za1jK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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