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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f4d4688921292d6cc1e932058c4821352507e1e0a8f515059c2bc0fc12d827' 
  AND token = 'LDqDURwNe374ykSx0ahto+Iqb3dQDWRErnzR4If6Gn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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