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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97cfea4a6e57cec09a5b504dc548a22f5d6598ad78d582aa2dd2011e922f998' 
  AND token = 'PTjy1U6dSDqiFCcky/ZRb7JEmKV7SWRUx8x9k2OAqfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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