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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f734c837889f704f8f12ccdcf1cb329846f2221550626af22ab3cc62ec4538' 
  AND token = 'PkBN5Wxrnv+C1Sz2fIH10Lv8O63+iu/TeOaWkv7i7x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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