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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5c9e0d5f1b4bbe964342c8d04f69f41fdfd61a13af7e2496d867d8b2f95a7b' 
  AND token = '3zFHpA/dU4OZkL2xlOKSu6oEG2NbIfVkfc9NtbWWOlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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