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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984135c55b5ad1fda0e3c7dcdad5f6a2ca462cf5f8c8a5647f161dac98bab587' 
  AND token = 'ZcxG4Hflb69aA6tA0NSJUe+ww/e+Rj4pWB2gELN+YH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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