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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28305b4cb3526b5debc37eafa1737c75ba3752f80084f9baeb8c5e6df0db1d9' 
  AND token = 'glUFunX7Kt0H1b+tgZaj+iVkaHaoKowxX1EPY1TA+mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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