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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f9dfacde4aa9401fc278916fd9f6668ffe36b53298d1a83dccb0e06bb6402c' 
  AND token = 'l/4/2UuMZoSyL8Nye+FBtIppcp7+X7V1iK4q+J5kbtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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