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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8305f4e7677ad7e76d428bf8a9682ac5b4ec6334ab7e5b49655609e43c3d8693' 
  AND token = 'zWe/LiCK+p4WW9NTUNX2gZ03MYIT8cAbpUPS/yDTH5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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