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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88199de829099b9efc54eec25fc20c62a9253c9eb0852647c68b88239f6a2faf' 
  AND token = 'xJn7zOgY2mTLphv9EwTW1/daMcE15QMQi/JUAJpi9L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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