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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e7b95fc74fe523d8f406603a53d34bc7e44f63af61c3a236c6a99019e99245' 
  AND token = 'S7Zq2rQvP/QnUAh7eRzEiddKMwDXi2TWlfa2oyIsyZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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