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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a29e353db797c64f79391722b5a61ef8756739f1fcfb2a58069d5f7d5f292e7' 
  AND token = '4CXmySXhwXEV9V1h8zxgHxfQPWD3sbiOaseV583sJ7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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