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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07185caebd4575cdf01fd87db323da7f80c9cb279f6824d3361c38058a7eaea5' 
  AND token = 'N2GiGkI7T90B5u8wbnfRcYJ8/USbKVQs6ghGqta1+L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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