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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd0008ad8acdf8b95ac968bf9d62e493638fec0500f30c359b7b10db7323c23' 
  AND token = 'XdMViK1gCJ44O1WwkEPu0PqfHC2eSZG4djnNvAP/PU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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