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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1116bfdffba2c9841ff3e24120982942d80293ac22efd2fd9f53b47b1d97c6ec' 
  AND token = 'cu+halRw+IZ9qwlb00cmOr1K8SW4VWq6z/MjjIJrIWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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