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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2672b4c11e5c7eb3b745d88ca074bef069e3977710eedf263d8948f5808cecaf' 
  AND token = 'iY9U5FPSX4c6j5raUGU/3bXH9w6yoE6WqL3I+mjSijk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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