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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5122301c5e5bb5c98dd4fc6dd99fa5179d181f3587031f4aedb736f55b57d4ef' 
  AND token = 'Gw7S4BHXHd8lBk8d+B0RdUzthVJ3l3pdoXEPwSLaq9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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