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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3add7475cbdfb0881c3cc60dc5beb3dd7bb12a26d5a735fbde1bc34558a65175' 
  AND token = 'qYdFrH+uDo0xxKK71MmSjA4DB/at5bGRaP3ZoHY94OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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