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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b4f39ee4b904d3ff414d8d12459528c88060dbb7b82948354e0d5362bf965b' 
  AND token = 'Gu52mhpEGtrdDjssvizfkT0OfuG+knBD0ov9iq4VzWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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