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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51f5831a228f66e2ce4982f93cac2634621f9262b0a6674fc0fcd5b6dd72a4a' 
  AND token = 'la6Wa3qt+lY3/JGfLTsd69U35DbKH36scmIjUK4DCnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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