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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd231a5123b8eeb1f40cd704c863947c415422512897dc8a3659c3714c8e5774' 
  AND token = '5Q/7bXemhFhP+WnKM0UfeRexyJeqY0mG0ovHYfb0M3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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