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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8674fac25117e732c5bb89701af769f3976c3b49c332f792d8cb18a457ca3cf7' 
  AND token = 'w5cIr+Wv0/BSItjXhDCfGYkVWor3jNFSnpw6f0WarvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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