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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f360f4673f1b7f619b89f94beb9ac622e961f81dee139064232bdeaf869dcb' 
  AND token = 'bTswkdy8O+Oe/20f8CimFDCsQ2Wv+3V0/BhWksGsAS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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