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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f4893c0d770f3c9a98fdcb5d609b705fd13fad4a4a97cd2a50e8f60974409e' 
  AND token = 'LvOcBm7R44/Xic4+qnWNYfE5awPh8IrTkTa28lP+V94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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