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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11cbdfc3a35b5f0eb117d3e716c81592ddf4a95f2129f95f5d5cb7296ec004f' 
  AND token = 'WNVLNpyGbjNkRSY8Cxt+hbzfkqRNWbpPixFM6lJZzbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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