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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256ba554fe4ea7c55b873ecb74a191ef7af480131a814f8cf2ec8f50b9aa8df4' 
  AND token = 'XytPIhLLIveh9AtsMrdEJU1AynI+YSmf5zuGzQCZ+wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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