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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a85209e9ebeb1327d915784f9df16745a2939f3648edb2a981857105d3a770' 
  AND token = 'sQ920AKxSv6K/v6NSDvjeW58+9Iu3EBm0U6+WnaHgU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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