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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e22efbcad14be4f8ae1fee0543ce16ee7c0eae08b826dc2e2208d64b5def5406' 
  AND token = 'z808RUdKugP5UGMS66UwDKrNyynOdYQUY+MUHN8WARg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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