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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22817e5f6fb7d8ba4d25ed65498aaec24da8854a6f9131d17bd89adb72a4e937' 
  AND token = '2oRceqMswuRAKjFcFpwcKwMvfd/ZqHyYB785nv2dSXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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