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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17b845a5d865252a488000f6dad7061b7056ece836a75177c3c8e478eec64c2' 
  AND token = 'TrgH2p3a7j/4iWR80BDtknt7AbByMwauiY/aYsVnzHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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