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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c30868be06f2fd1936db62ab0afef0d244df19961a4c030e591a17a580326d' 
  AND token = 'DBr2IdH1gqgJPtRHLf8BRQf9sUTcLwm9ZDHT4H9R+rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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