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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7174183c8d4bd77ea7b4a0c987c14915669078b6b1cf419eadb99888c0722218' 
  AND token = 'BXGco9S4xlFENSmhign82AAl8P7y0xdxh9epHMmsawE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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