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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3b0fa17d8f5214bfcad0fd62a1e53b4200f78926058a95140f4cdfe09b92e3' 
  AND token = '2Wlb336/o14O9Zbx4FqGRtHvr9fJQy2ndbsQVxFIL0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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