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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328c3d1aacccab66a27d2807de3bbe425932678be103aabc953cd99189cebc7d' 
  AND token = 'UNaX88Tp84H2wm4y134NuQaZJPjWtUGM/gapL8jGm/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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