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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212c5f3cf1f2dc52e6f58462bb48d86d2b24fbec63ffc539e1c1e1b6ac8c3e81' 
  AND token = 'khTIraaAcyGG4TqFvc1zfUXTVyP44fusJzQnzDOY2uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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