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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585d47d6a73d6ff59406ee1ad931e3a48bac1b976b8f8622db9f234966e58996' 
  AND token = 'l3Rr0/yCEpouKA5pPG+as3lKg9UXw9PvNrJtIncHK6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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