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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a1ae5ba6c460837a532e6c1ce9e87fa5dd1530567272b889785fe6c3c0bf6d' 
  AND token = 'AZ+4uzNX5ST5Jj0A4JZeCRipzLy4zS8ew8MrqNHbtJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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