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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173da17b3a1e3bde134c88ae173c584535d3e579c6df0c31d589a6ddae62c4f5' 
  AND token = 'AAlTEdzhl1js4smtOewlcKQ6dfsIa91t3KhU3SoqX3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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