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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc25dc8d7489d233fab496bb77cf4c6e86f3484ac8fd6d3b52c75f52f728d63' 
  AND token = 'JMNtq4n7uks3EuKalA4Tzl51GURVLJWHsCx0AFQKOQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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