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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a52dd6d51e60915591c8d8d79a618ad98b4b16c1c49b091b86e08b342be933' 
  AND token = 'l/GI2kMg0t21VqxjhXPplsDDfHEjaaLwcjALu6nYS1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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