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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7448bcc1ef5d5fa60bd4dc6554d15596600ce7850eb0907c53d3ea5dd98571e7' 
  AND token = 'soLG1z90giM0RgaNriOww6vTSBpf20+gLGZzffIUfis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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