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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e0d67537dcd35b95e286846f2286448395ae5810fe74fc57e7ef07e112529c' 
  AND token = '9ZQVwYm7F7Rp16b1NECqSECkDfqt5YEaDvRxwvfUycQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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