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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0909822be82bce062faed0f159f0e6ffef29b15bbb272ab3778ab65fa0ee7717' 
  AND token = 'o6fZB8hD7NK7055ZXy9/4sBMqGr5TiXxYNVgENpZs6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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