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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cecac65e7ae81c025c09843532e913a27d8f2a9424e0865d78332b16cde62e3' 
  AND token = 'IRSgXQQvisNIzXtBrIZSelC1+D5nHo4Jr8DwmMSTv9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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