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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4262b846862903f2cbff15040f43192908e9b6bea6dc8cda9c9a0046a9f86b' 
  AND token = 'lXBpM8Z57/1iLwqgE3Eg9ItQISC/z+D8ypigqmvqULA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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