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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228ab60fdb4c9f0fed5161e4741d693800582541a2dbb5d379fc5f6f44e2ca4b' 
  AND token = 'Brdd8uKGajFaipQmJAwJhCK2krlNI8pfb589BpFxuYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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