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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b961669b9dc11876e01734c34f2c17c9fa5ecd7aa25ca1dcbb633363ee32028' 
  AND token = 'BhM1iU4UTDxfc45l+AhGY5k+Bs1hRbtTV8CB6BgHhwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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