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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a94c0a0838817f51986533d1710df72f93c3c4941c5a4e89889984ebeb3c4e' 
  AND token = '9k9+qwRSOqTeEYtrPP5If+8kVYT75Xz+2/35bav9yRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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