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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd663e2db213def3c5b6446a15535eeb1707964b438f3ad8b8cd9b199101b35c9' 
  AND token = '4DyQe65BziNIZejDmFEudfnhqYVxSLy2ql1tYHqeKrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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