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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f009980e3acde72d3426ae93ca095f17fececb167800df07c419ff845976193f' 
  AND token = '/lJHy0g04LbE9HHAaMoEWC5ySQw0X+OplYwf+UB/SP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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