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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e216ebe04f6f685d5deb1af251adba7c922a51c58dd9e8e1a5a2b56797509d88' 
  AND token = 'IAS6PLU0Z18rFl1z9GTUX/Vmnwghgf91uobCwd2I/p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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